JpaSurveyRepository.java 文件源码

@Override
public SurveyEntity findByCode(String code) {
    logger.log(Level.INFO, "Attempting to find survey '" + code + "'");

    Query query = entityManager.createQuery("select s from survey s where s.code = :code");
    query.setParameter("code", code);
    try {
        return (SurveyEntity) query.getSingleResult();
    } catch (RuntimeException e) {
        logger.log(Level.WARNING, "Error getting survey from database", e);
        return null;
    }
}